Tabbing from comment box moves focus to undefined place

[ghost]

Describe the bug

Using keyboard navigation, when pressing tab in the comment box the comment box is closed and focus is shifted to something undefined. Tabbing should move focus to something like the current or next value box.

Steps to reproduce

Write a time value in a box. Press tab and space to open the comment box. Write something. Press tab again. Focus is now no longer in a value box but somewhere undefined on the page.

Environment

v1.0.7-beta

Expected behavior

It might be ok to close the comment box when pressing tab key but at least focus should be moved to a value box. We might also need to check need for aria alerts/messages to explain what happens since it is a bit strange that the comment box disappears automatically when you had to click manually to open it. Suggestion: Either open and close on tab or require manual open and close.